Check the connection details using the Spotlight Configuration Tool
Open the Configuration Tool. You will find the Configuration Tool on the desktop of the computer where Spotlight Cloud is installed. Double click the desktop icon.
VMware Server address
Check the address is a valid IP address or hostname of the ESX server or VirtualCenter server.
If you have a VirtualCenter server then connect to that in preference to the ESX host. That way if the virtual machine migrates from one host to another the VirtualCenter server can still be interrogated for data for the virtual machine.
Authentication
Verify the user has at least a read-only role for the ESX server or VirtualCenter server.
VMware Server availability
Verify the VMware Server is available and accessible over the network. Verify TCP port 135 is open.
The alarm will clear automatically if the error is due to the service being down or network problems and the error condition goes away.